A shared channel is an open room
PMR446 is useful for quick calls because compatible radios in range can hear the same channel. That also means another listener may hear you. There is no private ownership of a normal PMR446 channel, and a tone code does not make speech confidential.
What CTCSS and DCS are for
CTCSS and DCS are settings that tell a radio when to open its speaker. They can reduce the number of unrelated calls you hear if your group uses the same setting. They do not encrypt your voice, change the channel frequency or stop another receiver from listening. Someone with the tone filter switched off may still hear your call.
Keep radio messages light
Treat the channel a little like a public conversation in a café. People nearby with compatible equipment may be able to listen, even if you do not hear them. A tone setting may make your handset quieter, but it does not stop someone else receiving the same transmission. There is no need to worry about ordinary friendly chat; just keep anything genuinely private for another method.
For a family or walking group, agree simple radio names and meeting points without broadcasting full names, home addresses or door codes. If someone wants to share a profile, use the station’s Share button and check that the person is happy with the listing. PMRMap uses broad areas so people can find one another without publishing a precise home location.
Can another radio hear me?
If you are on the same channel and within usable range, another compatible receiver may hear your call. Whether its speaker opens depends on the radio settings. CTCSS and DCS can filter which calls you hear; they are not passwords and do not provide encryption. Analogue FM speech is understandable to another compatible radio tuned to the same setting.
Use the radio for ordinary coordination and friendly conversation. If a subject needs confidentiality, move it to a private method. You can read the PMRMap privacy notice to see how profile information on the site is handled; that is separate from what people can hear over the air.